welsby



(No Model.) 5 Sheets-Sheet 1.

A. W. D. BELL 8v J. WELSBY.

l ELEVATOR. No. 469,368. Patented Feb. 23, 1892.

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(N Model.) 5 sheets-sheen 3.

A. W. D. BELL & J. WELSBY.

BLEVATOR.

N0. 469,368. Patentedl'eb. 23, 1892.

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(No Model.)

ELEVATOR.

No. 4693Q8. Patented Feb. 2s, 1892.

WZ/Mmes i UNiTED STATES PATENT OEEICE.

ARTHUR VILBRAHAM DILLON BELL AND JOHN VELSBY, OF ETELLINGTON,

NEV ZEALAND.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 469,368, dated February 23, 1892. Application iiled April 23. 1891. Serial No. 390,143. (No model.)

To all whom. t may concern-.-

Beit known that we, ARTHUR WILBRAHAM DILLoN BELL and JOHN WELsBY, subjects of the Queen of England, residing at the city of Vellington, in the Colony of New Zealand, have invented new and useful Improvements in Apparatus for Actuating Lifts, Elevators, and Similar Machinery, of which the following is a specification. ro Our invention relates to improvements in apparatus for actuating lifts, elevators, and similar machinery, and more particularly to the method of arranging the ropes and pulleys of such machinery. The principal objects of our invention are, rst, so to arrange the ropes and pulleys that a Single rope or multiple ropes may be arranged with pulleys so placed that either the power or velocity may be readily increased zo or diminished with greater simplicity in working than heretofore, and accurate adjustment of the tension on the single or several ropes and in such a way that each rope lies in avertical plane throughout its length; second, to remove the liability of the ropes becoming entangled and reduce the friction at the same time that the speed of the lift can be readily increased or diminished, and, third, to provide a simple differential apparatus for lifts 3o and elevators. life attain these objects by the mechanism illustrated in the accompanying drawings, in whichA v Figure l .is a front view of our apparatus showing treble gear in action. Fig. 2 is a 3 5 front view of the same, but with double gear in action. Fig. 3 is a front view of the same with only single gear in action. Fig. 4. shows alternative method of arranging the upper pulleys. Fig. 5 is afront view of the lower part 4o of our apparatus in detail and drawn to a larger scale. Fig. t5 is a side view of the same. Fig. 7 is a front view of the pulley-frame. Fig. 8 is an end view of the saine. Fig. 9 is plan ofthe same. Fig. 10 shows a method of lifting from a jib or cat-head.

Similar letters refer to similar parts throughout the several views.

a is the cylinder commonly used for lifts or elevators actuated by steam or water power.

l) is the piston and rod of the same.

c is the cross-head, attached to the pistonrod b and carrying pulleys p, p', and p2.

c' are guide bars or rods fastened to the cross-head o and extending upward, so as to form guides for a purpose to be hereinafter described.

d is a beam or support,'to which is attached a guide-piece d', through which the bars or rods c' slide freely.

r are the ropes or chains,whicl1 may be either single or in duplicate or of any number desired or required for safety and working parallel with one anotherin grooves formed in the pulleys for the purpose. (See Fig. 6.)

p 192 are pulleys to receive the lower ends 65 of the ropes, turning freely in bearings q, which are capable of sliding in the guides c.

p3 are the upper guide-pulleys for the ropes, ,Y working in bearings fastened to a beam or support s.

p4 are the upper guide-pulleys, placed on suitable supports s in a vertical position in places where this arrangement is more convenient.

q are cotters or wedges for securing or re- 7 5 leasing the bearings q. and for a purpose to be hereinafter described.

t is a snatch-block having a weight t', for a purpose to be hereinafter described.

a is a jib or cat-head. 8o

u is a lifting-hook for the rope or chain.

y are set-bolts to receive the terminal ends of the ropes.

It will be seen from this description of the several parts and by reference to the draw- 85 ings that our invention consists in arranging the ropes and pulleys attached to an ordinary elevator or hoisting machinery in such amanner that a series of pulleys p p p2 are in a vertical plane with the piston-rod; that these oo pulleys may be arranged to take one or more ropes, such ropes working all truly parallel with one another, each capable of bearing the whole load in case of accident; that these ropes are guided over pulleys p p', dsc., in the 95 manner of ordinary pulley-blocks, but placed separately in such a manner that each set of ropes is in the same plane, and therefore do not cross or chafe, thus rendering them much less likely to become deranged, which is a very I eo ropes are attached to a cage or elevator or4 important feature in working with long lifts and short cylinders. v

The apparatus, as shown in the drawings, elevates the load by thedepression of the piston, the power being applied above the piston and the load being elevated to a greater distance than the stroke of the cylinder. i The pulleys p p2 are capable of being fixed in positionA in the guides c by means of the cot-ters q', in which oase the pressure on the piston is free to act on all the ropes equally, all the three pulleys being fixed in position in the guides c and rising and falling with the said guides and the piston-rod b, thus giving a speed to the load L of six to one of the piston speed. (See Fig. l.) Then the Cotter Q ofthe uppermost pulley is withdrawn and its slide q released, the said pulley will assu-me the position shown in Fig. 2 and will remain in that position during the stroke of the piston-rod b. The ropes attached to this pulley then receive no power or pull from the piston and the only acting pulleys are the two below, which then give a speed of four to one to the load L in comparison to the piston speed as shown in Fig. 2. n like manner if the cotter q of the second pulley is also withdrawn the pulley p alone will be actuated and the speed of the load will be as two to one of the piston speed as shown in Fig.

In Fig. 3 is shown a method of throwing the pulleys p and p2 out of gear without of cotters q.

We thus have the-facility .of rapidly regu-` lating the height of the lift or the load to be lifted, the greater weight being deposited on the lower floors of a building, ifdesired, and the lighter weights on the upper floors at the same time, that -by'two or more liftings from one floor to the other the heaviest weights may be lifted as high as desired. By the setbolts y the tension on each rope may be set to the greatest nicety, so that all may act exactly together.

In Fig. l0 is shown a jib or eat-head, over which one of the four ropes working in the grooves of the pulleys may be carried, so as to lift weights at the saine time that the other the use weight, thus making the apparatus suitable for lifting weights and actuating hoists. We prefer this to be done in the following manner: One of the ropes being led. through the snatch-block t and over the jib or eat-head u and pulley u', the weight t descends and holds the hook againsta stop on the cat-head or jib and out of the way when not in use; but so soon as the rope is required to be put in action for lifting the ram or piston descends, lifting the snatch-block t', which is then pinned to the cat-head, allowing the hook U to descend and pick up a loadfwhich is lifted by the return of the actuating-piston. It is evident that the pulleys p p p2 might be placed on this method with a like effect in cases where the lift is actuated by a downwardly-working piston-or ram in the cylinder, pull-rods being attached to the cross-head `on the ram and connected -to the pulley-frame, and also that increased speed may be obtained by increasing the number of pulleys.

YVeA are aware that prior to our invention lifts and elevators have been actuated by ropes working together parallel with one another on the same sheaves, this being done for safety incase one rope should break, and also that double power has been obtained by the arrangement of such ropes acting over a pulley. Ve therefore do not claim such a combination, broadly. It is furthe-r evident that in some eases the differential gear is not required. .The slide-ba-rs c can be dispensed with and a plain cross-head used of the type shown in Fig. 4; but

YV hat we claim as our invention, and desire to secure by Letters Patent, is-

The combination, in a hoisting apparatus, of the cross-head c, a stationary guide d for said bars, and lthe pulleys 1J p2, having movable bearings q, slidabl-e between the bars c', whereby said pulleys can be thrown out of gear to give differential action to the load to be lifted,`all substantially as described.

.ARTHUR WILBRAIIAM DlliLON BELL. JOHN WELSBY. lVitnesses: y

HENRY HUGHES, W. E. HUGHES. 

